{"id":571,"date":"2015-06-19T14:56:15","date_gmt":"2015-06-19T06:56:15","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=571"},"modified":"2015-09-09T21:46:57","modified_gmt":"2015-09-09T13:46:57","slug":"%e4%bd%bf%e7%94%a8sql%e5%ae%9e%e7%8e%b0%e5%af%b9%e9%82%ae%e6%94%bf%e7%bc%96%e7%a0%81%e5%88%86%e7%b1%bb%e8%a7%84%e5%88%99","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=571","title":{"rendered":"\u4f7f\u7528SQL\u5b9e\u73b0\u5bf9\u90ae\u653f\u7f16\u7801\u5206\u7c7b\u89c4\u5219"},"content":{"rendered":"

\u65e9\u6668\u5728\u5927\u962a\u5de5\u4f5c\u7684\u5b66\u957f\u53d1\u4fe1\u606f\u8fc7\u6765\u8981\u60f3\u7528SQL\u5b9e\u73b0\u5bf9\u65e5\u672c\u90ae\u653f\u7f16\u7801\u5206\u7c7b\u7684\u89c4\u5219.\u672c\u6765\u5b66\u957f\u53ea\u9700\u8981\u505a\u6982\u8981\u8bbe\u8ba1\u5373\u53ef,\u8be6\u7ec6\u8bbe\u8ba1\u548c\u5f00\u53d1\u90fd\u662f\u5916\u5305\u7ed9\u8d8a\u5357\u4eba\u505a,\u4f46\u662f\u62c5\u5fc3\u8d8a\u5357\u7684\u7ae5\u978b\u65b9\u6cd5\u4e0d\u80fd\u591f\u6ee1\u610f,\u7d22\u6027\u5c31\u76f4\u63a5\u628a\u5173\u952e\u7684\u6b65\u9aa4\u90fd\u81ea\u5df1\u5b9e\u73b0\u6389,\u60f3\u60f3\u4e5f\u662f\u4e3a\u4e86\u4e16\u754c\u548c\u5e73\u505a\u4e86\u4e0d\u5c11\u8d21\u732e;<\/p>\n

\u89c4\u5219\u662f\u8fd9\u6837\u7684:
\n1.\u65e5\u672c\u90ae\u7f16\u662f7\u4f4d\u7684;
\n2.\u6700\u7ec8\u7684\u7ed3\u679c\u96c6\u53ea\u9700\u8981\u4e24\u5217(\u524d\u7f00 \u4e2a\u6570);
\n3.\u7b2c\u4e00\u4f18\u5148\u7ea7\u662f\u5c3e\u6570\u4e3a[00]\u7684\u90ae\u653f\u7f16\u7801;
\n4.\u7b2c\u4e8c\u4f18\u5148\u7ea7\u662f\u524d5\u4f4d\u6570\u5b57\u76f8\u540c\u7684\u90ae\u653f\u7f16\u7801,\u53ea\u5c55\u73b0\u51fa\u73b0\u6b21\u6570\u5927\u4e8e10\u6b21\u7684\u7ed3\u679c,\u5982\u679c\u4e0d\u8db310\u6b21\u7684\u90ae\u653f\u7f16\u7801\u8fdb\u5165\u4e0b\u4e00\u4f18\u5148\u7ea7\u7edf\u8ba1;
\n5.\u7b2c\u4e09\u4f18\u5148\u7ea7\u662f\u524d4\u4f4d\u6570\u5b57\u76f8\u540c\u7684\u90ae\u653f\u7f16\u7801,\u89c4\u5219\u540c\u4e0a;
\n6.\u7b2c\u56db\u4f18\u5148\u7ea7\u662f\u524d3\u4f4d\u6570\u5b57\u76f8\u540c\u7684\u90ae\u653f\u7f16\u7801,\u89c4\u5219\u540c\u4e0a;
\n7.\u7b2c\u4e94\u4f18\u5148\u7ea7\u662f\u5269\u4f59\u5176\u5b83\u7684\u90ae\u653f\u7f16\u7801;<\/p>\n

— \u6d4b\u8bd5\u7684\u6570\u636e,\u751f\u621020W\u4e2a\u90ae\u653f\u7f16\u7801;
\nDROP TABLE TBPOSTTEST;
\nCREATE TABLE TBPOSTTEST AS
\nSELECT LPAD(ROUND(DBMS_RANDOM.VALUE (1, 9999999)) , 7, 0) postcode FROM DUAL
\nCONNECT BY LEVEL <= 200000;<\/p>\n

— \u5b9e\u73b0\u7684sql\u8bed\u53e5;
\nSELECT PREFIX, COUNT FROM (
\nWITH
\nP0P0 AS (SELECT ‘____00′ AS “PREFIX”, COUNT(*) c0 FROM TBPOSTTEST WHERE SUBSTR(postcode, LENGTH(postcode)-1) = ’00’),
\nP1P5 AS (SELECT SUBSTR(postcode, 0, 5) cp5, COUNT(*) c5 FROM TBPOSTTEST WHERE SUBSTR(postcode, LENGTH(postcode)-1) <> ’00’ GROUP BY SUBSTR(postcode, 0, 5)),
\nP2P4 AS (SELECT SUBSTR(cp5, 0, 4) cp4, SUM(c5) c4 FROM P1P5 WHERE c5 < 10 GROUP BY SUBSTR(cp5, 0, 4)),
\nP3P3 AS (SELECT SUBSTR(cp4, 0, 3) cp3, SUM(c4) c3 FROM P2P4 WHERE c4 < 10 GROUP BY SUBSTR(cp4, 0, 3))
\nSELECT ‘0’ AS “PRIORITY”, PREFIX, c0 AS “COUNT” FROM P0P0
\nUNION ALL
\nSELECT ‘1’, cp5 , c5 FROM P1P5 WHERE c5 >= 10
\nUNION ALL
\nSELECT ‘2’, cp4 , c4 FROM P2P4 WHERE c4 >= 10
\nUNION ALL
\nSELECT ‘3’, cp3 , c3 FROM P3P3 WHERE c3 >= 10
\nUNION ALL
\nSELECT ‘4’, ‘OTHER’ , SUM(c3) c2 FROM P3P3 WHERE c3 < 10)
\nORDER BY PRIORITY;<\/p>\n

— \u6d4b\u8bd5\u7684DEMO, \u628a\u6761\u4ef6\u6539\u4e3a\u5927\u4e8e2\u6761;
\nINSERT INTO TBPOSTTEST VALUES(‘123400’);
\nINSERT INTO TBPOSTTEST VALUES(‘123500’);
\nINSERT INTO TBPOSTTEST VALUES(‘123450’);
\nINSERT INTO TBPOSTTEST VALUES(‘123451’);
\nINSERT INTO TBPOSTTEST VALUES(‘123452’);
\nINSERT INTO TBPOSTTEST VALUES(‘123453’);
\nINSERT INTO TBPOSTTEST VALUES(‘123454’);
\nINSERT INTO TBPOSTTEST VALUES(‘123444’);
\nINSERT INTO TBPOSTTEST VALUES(‘123555’);
\nINSERT INTO TBPOSTTEST VALUES(‘123566’);
\nINSERT INTO TBPOSTTEST VALUES(‘124444’);
\nCOMMIT;<\/p>\n

SELECT PREFIX, COUNT FROM (
\nWITH
\nP0P0 AS (SELECT ‘____00′ AS “PREFIX”, COUNT(*) c0 FROM TBPOSTTEST WHERE SUBSTR(postcode, LENGTH(postcode)-1) = ’00’),
\nP1P5 AS (SELECT SUBSTR(postcode, 0, 5) cp5, COUNT(*) c5 FROM TBPOSTTEST WHERE SUBSTR(postcode, LENGTH(postcode)-1) <> ’00’ GROUP BY SUBSTR(postcode, 0, 5)),
\nP2P4 AS (SELECT SUBSTR(cp5, 0, 4) cp4, SUM(c5) c4 FROM P1P5 WHERE c5 < 2 GROUP BY SUBSTR(cp5, 0, 4)),
\nP3P3 AS (SELECT SUBSTR(cp4, 0, 3) cp3, SUM(c4) c3 FROM P2P4 WHERE c4 < 2 GROUP BY SUBSTR(cp4, 0, 3))
\nSELECT ‘0’ AS “PRIORITY”, PREFIX, c0 AS “COUNT” FROM P0P0
\nUNION ALL
\nSELECT ‘1’, cp5 , c5 FROM P1P5 WHERE c5 >= 2
\nUNION ALL
\nSELECT ‘2’, cp4 , c4 FROM P2P4 WHERE c4 >= 2
\nUNION ALL
\nSELECT ‘3’, cp3 , c3 FROM P3P3 WHERE c3 >= 2
\nUNION ALL
\nSELECT ‘4’, ‘OTHER’ , SUM(c3) c2 FROM P3P3 WHERE c3 < 2)
\nORDER BY PRIORITY;<\/p>\n

— \u6d4b\u8bd5\u7ed3\u679c;
\nPREFIX \u00a0 \u00a0 \u00a0 \u00a0COUNT
\n—————— ———-
\n____00 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2
\n12345 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 5
\n1235 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2
\nOTHER \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a02<\/p>\n","protected":false},"excerpt":{"rendered":"

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